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  1. #1
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    Water Chemistry Aeration vs pH vs KH

    i'd always thought with such a large shower filter on my pond, aeration levels would always be pretty high.
    But I've been playing around with my pond aeration for the last few weeks using smaller PA45 air pumps.
    and moving the airbar position and putting that and the bottom drain air pump on timers to run more.

    what i found is that before my pH was always around 7.2-7.5 over 24hrs with KH at 2
    but with extra aeration my ph is now around 7.4-7.6 over 24hrs with Kh at 2 exactly the same.
    so obvioulsy driving off more CO2 but it has also helped stabilised my pH more so i see less of a swing in 24hrs.

    another consequence has been i have had to add a lot less sodium bi carbonate to buffer the water,
    so when the pH was dropping to 7.2 due to increased levels of CO2 it must have been consuming more carbonate ions,
    but now it doesn't drop so low, i'm not having to add 2 or 3 cups full of bicarb a week on top of my auto dosing to keep up.
    and i've even had to back off the auto dosing a bit too...



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  3. #2
    That's a perfect explanation of the effect that aeration has on your pH, Dave,

    In my experience helping people with pH problems, I've found that many just assume aerating a pond is just adding oxygen and don't realise that it's also important in driving off dissolved carbon dioxide and that increasing the aeration will gas it off which will improve pH stability.

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  5. #3
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Very interesting Dave as I have to add a lot of sodium bicarb to keep my kh up as just ordered another 25kg sack.
    Maybe try some extra aeration.
    John

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  7. #4
    Yet another reason to consider air-lift circulation it seems
    My DIY ponds from 1988 until present day.
    All can be found here:
    https://www.ukzero.com/pond.htm

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  9. #5
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    My koi seem to be a lot better since doing an airlift
    John

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